How long is the flight from Seattle to Washington, D.C. Dulles Intl Airport?

Alaska Airlines and United Airlines can get you from Seattle to Washington, D.C. Dulles Intl Airport in just under 5h. Your travel time will be generally consistent. Seattle and Washington, D.C. Dulles Intl Airport are separated by a distance of 3700 km. All flights are typically direct.

What is the cheapest airline to fly from Seattle to Washington, D.C. Dulles Intl Airport round-trip?

Our cheapest airline available from Seattle to Washington, D.C. Dulles Intl Airport is Alaska Airlines. Our recent data shows that you can find tickets from as low as C$ 222 on this airline. Alaska Airlines is 65% cheaper than the average price of flights available within the next 90 days to this destination.

Weekly flight availability from Seattle to Washington, D.C. Dulles Intl Airport

The most flights from SEA to IAD are scheduled on a Saturday (19 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 mm per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

What are the cheapest flights from Seattle to Washington, D.C. Dulles Intl Airport?

While on average a flight from Seattle to Washington, D.C. Dulles Intl Airport is generally C$ 1,183, our data shows the cheapest flight currently is C$ 222. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay C$ 976 for that flight.

What are the most reliable airlines from Seattle to Washington, D.C. Dulles Intl Airport?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Washington, D.C. Dulles Intl Airport on time: Atlas Air (100%), Iberia (100%), Avianca (96%).

What airport do you fly from for flights from Seattle to Washington, D.C. Dulles Intl?

If you book a flight to Washington, D.C. Dulles Intl from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 18.4 km from the centre of Seattle. There are 10 flights from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl per day from 1 airline.

Can I find deals for flights from Seattle to Dulles Intl that include hotel bookings?

Yes. In addition to deals on Seattle to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Seattle to Dulles Intl?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Dulles Intl.

Can I find deals for business class flights from Seattle to Dulles Intl?

Yes. Cheapflights offers flight deals from Seattle to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 227+ Cheap Flights from Seattle to Washington, D.C. Dulles Intl Airport

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl are usually found in February or April, booked 86 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

Cheap flight deals from Seattle to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from Seattle to Dulles Intl
Explore the most affordable flight options available from Seattle to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Sat 5/1211:55 a.m. -

Nonstop5h 04m

Sat 12/127:00 a.m. -

Nonstop6h 10m

Deal found 21/10C$ 528

Sat 5/128:09 a.m. -

Nonstop4h 59m

Tue 8/123:14 p.m. -

1 stop9h 44m

Deal found 25/10C$ 536

Tue 1/122:05 p.m. -

1 stop7h 19m

Wed 9/125:55 p.m. -

Nonstop6h 06m

Deal found 22/10C$ 542

Tue 1/124:30 p.m. -

Nonstop5h 01m

Sun 6/127:00 a.m. -

Nonstop6h 10m

Deal found 20/10C$ 556

Fri 4/128:09 a.m. -

Nonstop4h 59m

Tue 8/123:14 p.m. -

1 stop9h 44m

Deal found 23/10C$ 564

Thu 24/128:30 a.m. -

Nonstop4h 58m

Tue 5/16:53 p.m. -

1 stop17h 33m

Deal found 21/10C$ 570

Wed 25/117:04 p.m. -

1 stop7h 15m

Thu 26/118:15 a.m. -

1 stop9h 24m

Deal found 21/10C$ 576

Mon 30/116:30 p.m. -

2 stops20h 09m

Sat 5/127:00 a.m. -

Nonstop6h 05m

Deal found 22/10C$ 577

Thu 3/128:15 a.m. -

Nonstop5h 00m

Sun 6/125:18 p.m. -

Nonstop6h 09m

Deal found 21/10C$ 584

Sat 21/118:09 a.m. -

Nonstop4h 59m

Fri 27/116:12 a.m. -

1 stop9h 07m

Deal found 21/10C$ 587

Fri 11/123:00 p.m. -

1 stop23h 39m

Wed 30/127:05 a.m. -

Nonstop5h 55m

Deal found 25/10C$ 588

Find flight deals from Seattle to Dulles Intl

Round-trip from	C$ 528
One-way from	C$ 227
Popular in	January
Cheapest in	February
Average price	C$ 629
Good round-trip deal	C$ 1,954 or less

Delta
1/12-5/12
Nonstop
11h 11m total
Seattle to Washington, D.C.

Search Deals

Frontier
21/12-31/12
2 total stops
27h 02m total
Seattle to Washington, D.C.

Search Deals

Highest demand for flights based on searches. 4% potential increase in price (C$ 42 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (C$ 35 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 2026

Search Deals

Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl.

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Wed 25/11

4:30 p.m.-12:20 a.m.

Nonstop4h 50m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 293

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Sat 19/12

11:44 p.m.-10:02 a.m.

1 stop7h 18m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 307

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Sat 21/11

10:56 p.m.-11:52 a.m.

1 stop9h 56m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 307

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Mon 21/12

9:45 p.m.-5:45 a.m.

Nonstop5h 00m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 321

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Mon 22/2

3:55 p.m.-11:51 p.m.

Nonstop4h 56m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 321

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Thu 26/11

8:09 a.m.-4:08 p.m.

Nonstop4h 59m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 321

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Sun 22/11

8:15 a.m.-4:13 p.m.

Nonstop4h 58m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 391

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Sun 15/11

4:30 p.m.-12:20 a.m.

Nonstop4h 50m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 391

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Sun 15/11

8:09 a.m.-4:08 p.m.

Nonstop4h 59m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 391

SeattleWashington, D.C.

SEA Seattle/Tacoma Intl - IAD Washington, D.C. Dulles Intl

SEAIAD

Seattle/Tacoma Intl

Tue 17/11

8:09 a.m.-4:08 p.m.

Nonstop4h 59m

Washington, D.C. Dulles Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 391

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/10

Showing 1-10 of 22 resultsSorted by cheapest first

Best time to book a flight from Seattle to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Seattle with our price prediction graph.

SEA-IAD

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Washington, D.C. Dulles Intl Airport

Prices

Airlines

How far ahead should I book a flight from Seattle to Washington, D.C. Dulles Intl Airport?

Booking 85 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Washington, D.C. Dulles Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Seattle to Washington, D.C. Dulles Intl Airport?

Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Dulles Intl Airport (average of C$ 433). Flying from Seattle to Washington, D.C. Dulles Intl Airport in January is currently the most expensive (average of C$ 900). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to IAD?

A simple way to save on the total cost of your ticket is to fly from Seattle to Washington, D.C. Dulles Intl Airport in the afternoon. If you’re flexible enough to do this you can expect to save up to 62% on your trip compared to booking a flight in the morning.

How much does it cost to fly round-trip from Seattle to Washington, D.C. Dulles Intl Airport?

Airfare is below average for this route at the moment.

Seattle to Washington, D.C. Dulles Intl Airport flights typically cost between C$ 555 and C$ 961 in December.
The cheapest round-trip price found within the last 5 days was C$ 528 on Delta (5 Dec-12 Dec).

Reviews of airlines servicing Dulles Intl

Read reviews from past customers who have flown Alaska Airlines from Seattle to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

7.9

Good

13,122 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Alaska Airlines

7.9

Good

13,122 reviews

Alaska Airlines

7.9

Good

13,122 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Related info for your journey

What airport do you fly from for flights from Seattle to Washington, D.C. Dulles Intl?
If you book a flight to Washington, D.C. Dulles Intl from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 18.4 km from the centre of Seattle. There are 10 flights from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl per day from 1 airline.
How long is the flight from Seattle to Washington, D.C. Dulles Intl Airport?
Alaska Airlines and United Airlines can get you from Seattle to Washington, D.C. Dulles Intl Airport in just under 5h. Your travel time will be generally consistent. Seattle and Washington, D.C. Dulles Intl Airport are separated by a distance of 3700 km. All flights are typically direct.
What is the cheapest airline to fly from Seattle to Washington, D.C. Dulles Intl Airport round-trip?
Our cheapest airline available from Seattle to Washington, D.C. Dulles Intl Airport is Alaska Airlines. Our recent data shows that you can find tickets from as low as C$ 222 on this airline. Alaska Airlines is 65% cheaper than the average price of flights available within the next 90 days to this destination.
What are the most reliable airlines from Seattle to Washington, D.C. Dulles Intl Airport?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Washington, D.C. Dulles Intl Airport on time: Atlas Air (100%), Iberia (100%), Avianca (96%).
What are the cheapest flights from Seattle to Washington, D.C. Dulles Intl Airport?
While on average a flight from Seattle to Washington, D.C. Dulles Intl Airport is generally C$ 1,183, our data shows the cheapest flight currently is C$ 222. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay C$ 976 for that flight.
Can I find deals for flights from Seattle to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Seattle to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Seattle to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Dulles Intl.
Can I find deals for business class flights from Seattle to Dulles Intl?
Yes. Cheapflights offers flight deals from Seattle to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Seattle to Washington, D.C. Dulles Intl Airport?
Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Dulles Intl Airport (average of C$ 433). Flying from Seattle to Washington, D.C. Dulles Intl Airport in January is currently the most expensive (average of C$ 900). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top airline flying from Seattle to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
Alaska Airlines	CheapestC$ 222	AverageC$ 459	FlexibilityNo cancel fee	On-time75%	Search Alaska Airlines flights

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How does Cheapflights help users find flights from Seattle to Dulles Intl?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Dulles Intl from Seattle today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Seattle to Dulles Intl?

Cheapflights helps you find that perfect flight to Dulles Intl from Seattle by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Seattle to Dulles Intl with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Seattle to Dulles Intl, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Seattle to Dulles Intl become cheaper?

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Cheap flights from Seattle to Washington, D.C. Dulles Intl Airport from C$ 227

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Seattle to Dulles Intl

Cheapest flights from Seattle to Dulles IntlExplore the most affordable flight options available from Seattle to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Explore the most affordable flight options available from Seattle to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Best flights from Seattle to Dulles IntlDiscover carefully curated flight deals from Seattle to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Discover carefully curated flight deals from Seattle to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Direct flights from Seattle to Dulles IntlExplore direct flight options from Seattle to Dulles Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Explore direct flight options from Seattle to Dulles Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Last-minute flights from Seattle to Dulles IntlDiscover last-minute flight deals from Seattle to Dulles Intl. Data last updated 25 October 2026 and is based on user searches.

Discover last-minute flight deals from Seattle to Dulles Intl. Data last updated 25 October 2026 and is based on user searches.

One-way flights from Seattle to Dulles IntlSearch for one-way flight options from Seattle to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 25 October 2026.

Search for one-way flight options from Seattle to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 25 October 2026.

Find flight deals from Seattle to Dulles Intl

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from Seattle to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Seattle with our price prediction graph.

Cheapflights Insights

How far ahead should I book a flight from Seattle to Washington, D.C. Dulles Intl Airport?

Booking 85 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Washington, D.C. Dulles Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Seattle to Washington, D.C. Dulles Intl Airport?

What is the cheapest time of day to fly from SEA to IAD?

A simple way to save on the total cost of your ticket is to fly from Seattle to Washington, D.C. Dulles Intl Airport in the afternoon. If you’re flexible enough to do this you can expect to save up to 62% on your trip compared to booking a flight in the morning.

How much does it cost to fly round-trip from Seattle to Washington, D.C. Dulles Intl Airport?

Airfare is below average for this route at the moment.

Seattle to Washington, D.C. Dulles Intl Airport flights typically cost between C$ 555 and C$ 961 in December.The cheapest round-trip price found within the last 5 days was C$ 528 on Delta (5 Dec-12 Dec).

Weekly flight availability from Seattle to Washington, D.C. Dulles Intl Airport

The most flights from SEA to IAD are scheduled on a Saturday (19 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing Dulles Intl

Read reviews from past customers who have flown Alaska Airlines from Seattle to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly from for flights from Seattle to Washington, D.C. Dulles Intl?

How long is the flight from Seattle to Washington, D.C. Dulles Intl Airport?

What is the cheapest airline to fly from Seattle to Washington, D.C. Dulles Intl Airport round-trip?

What are the most reliable airlines from Seattle to Washington, D.C. Dulles Intl Airport?

What are the cheapest flights from Seattle to Washington, D.C. Dulles Intl Airport?

Can I find deals for flights from Seattle to Dulles Intl that include hotel bookings?

How can I find direct flights from Seattle to Dulles Intl?

Can I find deals for business class flights from Seattle to Dulles Intl?

What is the cheapest month to book a flight from Seattle to Washington, D.C. Dulles Intl Airport?

Travelling to a place near Washington, D.C. Dulles Intl Airport?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Dulles Intl by adding a car rental and/or hotel reservation to your travel itinerary.

Direct flights to District of Columbia

Book a non-stop flight to one of these other cities located in District of Columbia.

Other flights to Dulles Intl

Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 25 October 2026.

Search flights from Seattle to Dulles Intl by cabin class

Find flights from Seattle to Dulles Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Seattle and Dulles Intl flights

Browse other Seattle and Dulles Intl flight options. Last updated on 25 October 2026.

Other flights from Seattle

Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on 25 October 2026.

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Top airline flying from Seattle to Dulles Intl

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Why should you use Cheapflights to find cheap flight tickets from Seattle to Dulles Intl?

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Can Cheapflights notify me if prices for flights from Seattle to Dulles Intl become cheaper?

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Cheapest flights from Seattle to Dulles Intl
Explore the most affordable flight options available from Seattle to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Best flights from Seattle to Dulles Intl
Discover carefully curated flight deals from Seattle to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Direct flights from Seattle to Dulles Intl
Explore direct flight options from Seattle to Dulles Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Last-minute flights from Seattle to Dulles Intl
Discover last-minute flight deals from Seattle to Dulles Intl. Data last updated 25 October 2026 and is based on user searches.

One-way flights from Seattle to Dulles Intl
Search for one-way flight options from Seattle to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 25 October 2026.

Seattle to Washington, D.C. Dulles Intl Airport flights typically cost between C$ 555 and C$ 961 in December.
The cheapest round-trip price found within the last 5 days was C$ 528 on Delta (5 Dec-12 Dec).